A couple team members and I are having trouble getting the Activity QA link to generate a preview with the changes we've made for our tests. I've tried most of the suggestions(toggling off audience rules, clearing browser, going incognito,etc) I've read here and not working properly so far. We have AEM 6.4 for our site. If anyone has any insight on why we're not able to see any changes, it'd be greatly appreciated.
You can try using a debug query parameter to check if there are any selector issues . Using the below query parameters will output console statements with the actions that target is trying to apply and if it is successful or not.
If using at.js append the preview link with &mboxDebug=console .If on mbox.js append with &_AT_Debug=console .